this morning, we'll hear what president obama has to say about that. and we'll get reaction from republican senator john mccain. >>> we want to get right to nbc's chief foreign correspondent richard engel. he's in cairo for us once again. richard, good morning to you. >> reporter: good morning, savannah, from tahrir square. this the iconic place that became the scene of massive demonstrations from the united states, calling for more democracy. now, there is an ongoing clash here as some demonstrators are trying to attract u.s. embassy, which is right on the edge of this square and you can see fear gas being fired from egyptian security forces trying to keep the demonstrators away from the u.s. embassy wall. a similar scene today in yemen, as an angry mob attacked the u.s. embassy compound in the city of sanaa a state department official says that all u.s. personnel that the embassy in sanaa have been accounted for and appear to be safe. another assault on a u.s. embassy, this time in yemen. protesters threw stones at the embassy walls in the capital, s